Improvement in roller-mills for reducing grain



i L, NEMBLKA; y Roller-Mill. for Reducing Grainlv y No. 209,829.Patented Nov. 12,1878.

A2 Sheetssheen 1.

L. NEMELKA. l Roller-Mill lfor Reducing Grain.

No. 209,829. Patented *,Novf; 12'111s7sl x if@ #2A Wndded N-PETERS,PNOT-LITNOGRPNEEL WASHINGTON. I!A C.

, according to my invention.

"Nrrnn STATES PATENT FFW? LORENZ NEMELKA, OF SIMMERING, NEAR VIENNA,AUSTRIA.

IMPROVEMENT IN ROLLER-MILLS lFOR-REDUCING GRAIN.

Specification forming part of Letters Patent No. 209,829, dated November12, 1878; application iiled May 11, 187s.

To all whom# may concern.- v

Be it known that I, LORENZ NEMELKA, of Simmering, near Vienna, -in theEmpire` of Austria, have invented certain new and useful Improvements inRoller-Mills, ot' which the following is a specication:

The object of this invention is, first, to furnish means for adjustingthe rollers of ro1ler` mills for grinding into flour grain alreadycoarsely ground,or whatis known as Sharps or middlings, the saidadjustment being effected in such a manner that the rollers will producethe best effect and with the requiredpressure, but without being liabletov be jammed together, and yet allowing obstacles accidentallyintroduced to pass through withl f out injuring the machinery; secondly,tovenable the grain or iour to pass twice through the rollers whileusing onlya set of three roll eis; and, thirdly, to arrangements forllubrieating the bearings of thero'llers ofrollermills v In.the.anpexedd-rawin-gs,ligireis a side `viewafrtiy in sectiomand Fig. 2a front-view, partly' in section, of a rollermill constructed Fig. 3 isa longitndinal, and Fig. 4 a cross, section of the axlebearin gs, withmy arrangement for lubricating the same. l

The construction of roller-mill shown in the' drawings consists of twoindependent sets arranged in the same framing, and as bot-h sets are ofexactly the same construction the same letters of reference have beenused for the single parts of each set; and it is evident that, withoutdeparting from the nature of this invention, the roller-mill may beconstructed with a single set instead of double sets.

\ rlhe sharps or middlings are introducedinto the hopper a, and passfrom here over the deliveryroller b, which is provided with a pivoted dor, c, to regulate the quantityn to be admitte From hence they passfirst between the middle grinding-roller, e, and upper griiidingroller,d, and then between the middle roller, e, and lowest roller, f, and arefinally led oft through the delivery-hopper g. The roller is arranged iniixed bearings h, and cannot be displaced during the workin g 5 but thebear'\r11gs of the two rollers d and f are arranged fn swinging bracketsi, pivoted at k li: on the eccentrics L l, which are formed ofonepiecevwith the axles 7c k. It is evident that, by displacingvthe'levers m m, which are keyed to `the axles 7c k, the rollers d and fmay be adjusted nearer to or farther from the roller e, as may berequired by the material to be ground. To prevent the possibility of thenoniadjustable roller e, their swinging brackets t' .i rest on thesetscrews n n.

The central axial lines of the rollersl and f lie alittle above thestraight lines o k, drawn from the center of the axial line of therollers to the center'of the axlesk ,a and it is evident that the nearerthe central axial lines of the rollers d and f approach the straightlines o k, the greater will be the pressure of the rollers el andf,resp'ectively, on the roller e. It is also evident that thisV pressureis self-acting, being caused by the weight of the swinging rollers 'dand j', and that therefore the said rollers d and f will give way and belifted if an unusually hard substance should come between them and theroller y e. screws an, on which the bearings of the swinging rollers dand f rest, the pressure of the rollers d and j' on the roller e may bevariedy a-srequired.

The levers m on are provided with set-screws p p, the ends of which iitinto. slots formed in the standards q, andr by means of these setscrewsp p the levers m m may be fixed in any desired position.

The standards q and 1', in which the axles 79 7c E v have theirbearings, are so arranged, as shown inFig. l, that when the bearings areworn the said` standards may be adjusted bymeans of the set-screws t. n

All the bearings of the rollers'areprovided with self-acting lubricatingarrangements, as4v 'adjustable rollers d and f being jammed to the Byadjusting the shown in Figs. Sand 4. Alubrieatingdi/skgu, a

is ixed tothe shaft, and' the oil raised by it from below is scraped offby the scraper v and distributed over both sides of the bearing.y Theo'il then flows back through the passages w together into themiddle,.from whence it is again lifted bythe disk a. Each roller is pr0.vided with a scraper,

lt is evident that, without departing from the substance of thisinvention, the arrange- 'ment ofthe parts for enabling a roller of a .A

roller-mill to swing' on an. axle and to be adjustable, as described,may be used in a set of a pair of rollers instead of a set of threerollers, and that therefore either the roller d or the roller fmay beomitted Without altering the character of this invention.

I claim- 1. In a middlings-grinding machine7 the means employed forzuljusting,` the position of the yielding grinding-rolls relatively t0that of the roll mounted in stationary bearings, which consist in thecombination7 with said yielding rol1s,oftl1e fulerumed bearings 2,shafts k, eceentrics l, levers my, and their grooved segments, thesetscre\vs p, and the brackets q, all arranged and operatingsubstantially as described.

2. The combination of the roller l or j', brackets z'7 axle k,eccentrics l, and levers m, essentially as deseribed,and for the purposedescribed.

in the set-screws u and a ixed support or` abutment for such set-screwseither on the frame or fixed bearing h, in combination with saidyielding or swinging bearings, substantially as shown and described.

In witness that I claim the foregoing I have hereunto set my hand this23d day of March, 1878.

L. NEMELKA.

Vitnesses:

C. O. PAGET, T. BARTA.

